A 151-mL sample of O2 was collected over water at 21°C when the barometric pressure was 742 torr. What mass of O2 was contained in the sample? The vapor pressure of H2O at 21°C is 18.7 torrA. What is the nass of o2 that was contained in the sampleB. What is the mole fraction of H2OC. What is the mole fraction of O2
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